import java.util.*;

    public class 打折 {
        public static void main(String[] args) {
            Scanner console = new Scanner(System.in);
            int price = console.nextInt();
            int cost = 0;
            if (price >= 5000) {
                cost = (int)(price * 0.6);
            } else if (price >= 2000) {
                cost = (int)(price * 0.7);
            } else if (price >= 500) {
                cost = (int)(price * 0.8);
            } else if (price >= 100) {
                cost = (int)(price * 0.9);
            } else {
                cost = price;
            }
            System.out.println(cost);
            //write your code here......
        }
    }

